Which statement is true about the part of the electromagnetic spectrum that human eyes can detect?
a) it is divided into nine ranges of wavelengths.
b) it contains only the colors of the rainbow and television waves.
c) it contains ultraviolet, visible, and infrared light.
d) it is divided into seven ranges of wavelengths (visible light royg biv).

The answer is D i took the quiz and I am in K12 hope it helps!

the box does not move because you need to use a force greater than 300 n. you are only using 50 n. it needs to at least be 301 n for the box to move because then it is an unbalanced force and it will move the way that the greater force is pushing it. if you use only 300 n it will be a balanced force and will not move because the force you are exerting on the   box is the same as its force.

hope this !

im sorry if i went too in depth, i am going to include a link to a video on khan academy that will explain this.   hope that you like the video and that it explains more in detail to you.

that is the link.

molecules are free to separate from each other and will take on the shape of the container. molecules move completely at random and high speeds. they vibrate in a fixed position and do not move around much. molecules expand to the edge of their container.